Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12879-017-2314-z/MediaObjects/12879_2017_2314_Fig4_HTML.gif)
Relationships between 1,25-dihydoxyvitamin D and radiological severity, parathyroid hormone and 25-hydroxyvitamin D at baseline. (a) 1,25-dihydroxyvitamin D by x-ray score (b) 1,25-dihydroxyvitamin D by parathyroid hormone (c) 1,25-dihydroxyvitamin D by 25-hydroxyvitamin D